P
PerryH
Hello.
I actually found this forum after performing a Google search for "POR15 sucks" as I was skeptical of the marketing. I think I found the right place to ask this.
I am restoring a (pretty solid so far) 1971 Pantera.
Presently I have the drain area under the cowl vents down to bare metal using a flexshaft dremel with flapdisk sanding wheels and wire brushes. I have cut my hands trying to get back in there as far as possible, but there are still places I cannot get to that have surface rust on them. I have a sandblaster, but that won't get in there far enough to get it all either. (Also, this is a monocoque chassis. The fenders do not come off. I would be blasting blindly on the underside of the front fenders so I could warp them from underneath if not careful with the abrasive selection and/or blast angle.)
This is just the cowl area for now, but later I'll be taking the undercoat off and there are frame rails where I will have a similar problem.
I have read enough here to see that the agreed upon answer is to blast everything down to bare metal, then coat with epoxy primer.
Fair enough, but what do you do in places where a sandblaster will not reach? Just shoot it with epoxy and coat with cavity wax? Or phosphoric acid to convert the surface rust first?
In the case of the cowl I do have the luxury of this being a water passage such that if I needed to rinse of Ospho or a similar product, the water would go out through the factory drain tubes (which are metal and I will clean the insides of using a cylindrical wire brush). Painting those will be a paint soaked sponge on a string after pouring a bit of paint down the tubes first.
I actually found this forum after performing a Google search for "POR15 sucks" as I was skeptical of the marketing. I think I found the right place to ask this.
I am restoring a (pretty solid so far) 1971 Pantera.
Presently I have the drain area under the cowl vents down to bare metal using a flexshaft dremel with flapdisk sanding wheels and wire brushes. I have cut my hands trying to get back in there as far as possible, but there are still places I cannot get to that have surface rust on them. I have a sandblaster, but that won't get in there far enough to get it all either. (Also, this is a monocoque chassis. The fenders do not come off. I would be blasting blindly on the underside of the front fenders so I could warp them from underneath if not careful with the abrasive selection and/or blast angle.)
This is just the cowl area for now, but later I'll be taking the undercoat off and there are frame rails where I will have a similar problem.
I have read enough here to see that the agreed upon answer is to blast everything down to bare metal, then coat with epoxy primer.
Fair enough, but what do you do in places where a sandblaster will not reach? Just shoot it with epoxy and coat with cavity wax? Or phosphoric acid to convert the surface rust first?
In the case of the cowl I do have the luxury of this being a water passage such that if I needed to rinse of Ospho or a similar product, the water would go out through the factory drain tubes (which are metal and I will clean the insides of using a cylindrical wire brush). Painting those will be a paint soaked sponge on a string after pouring a bit of paint down the tubes first.